javascript - custom validation not working with google recaptcha -

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i have added google recaptcha in page. , javascript custom validation too. problem first time validate function gets executed after not getting executed. here code

<script src="https://www.google.com/recaptcha/api.js" async defer></script>  <script language="javascript" type="text/javascript">     function submitform() {         if (validateform() == true) {             document.getelementbyid("form_1").submit();         }     }      function validateform() {         if (document.getelementbyid('email').value == "") {             alert(false);             return false;         } else {             alert(true);             return true;         }     } </script> </head> <form id="form_1" method="post" action="http://www.google.com" onsubmit="return validateform();">     <div id="divinvisiblecaptcha1" class="g-recaptcha" data-sitekey="my sitekey" data-callback="submitform" data-size="invisible" data-bind="submit_1"> </div>      <table style="height:100px; width:100px">         <tr>             <td>email</td>             <td>                 <input type="text" class="ampfield" id="email" name="email" dbfieldid="email" />             </td>         </tr>          <tr>             <td colspan="2">                 <input type="button" id="submit_1" value="submit" class="g-recaptcha" data-sitekey="my sitekey" /> </td>         </tr>      </table>





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